CN114915266B

CN114915266B - Radio frequency amplifying circuit and radio frequency front-end module

Info

Publication number: CN114915266B
Application number: CN202210509090.1A
Authority: CN
Inventors: 胡自洁; 倪建兴
Original assignee: Radrock Shenzhen Technology Co Ltd
Current assignee: Radrock Shenzhen Technology Co Ltd
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2023-08-11
Anticipated expiration: 2042-05-11
Also published as: CN114915266A; WO2023216847A1

Abstract

The invention discloses a radio frequency amplifying circuit and a radio frequency front-end module. The radio frequency amplifying circuit includes: the first coupler is configured to perform coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase; the first doherty power amplifier is connected with the first coupler and is configured to amplify the first radio frequency signal to generate a first amplified signal; the second doherty power amplifier is connected with the first coupler and is configured to amplify the second radio frequency signal to generate a second amplified signal, and the first amplified signal and the second amplified signal are 90 degrees out of phase; the second coupler is connected with the first doherty power amplifier and the second doherty power amplifier and is configured to perform coupling processing on the first amplified signal and the second amplified signal to generate an output radio frequency signal. The radio frequency amplifying circuit can achieve the aim of better impedance matching, and further improve the stability and the tolerance of the radio frequency amplifying circuit.

Description

Radio frequency amplifying circuit and radio frequency front-end module

Technical Field

The present invention relates to the field of amplifying circuits, and in particular, to a radio frequency amplifying circuit and a radio frequency front end module.

Background

Modern wireless communication systems require that wireless communication devices still maintain high-rate communication during fast movement, in order to fully utilize spectrum resources and improve transmission efficiency. The modern wireless communication system generally needs to be provided with a radio frequency amplifying circuit for amplifying radio frequency signals, and in the working process of the existing radio frequency amplifying circuit, the problem that gain flattening and impedance matching cannot be achieved simultaneously exists, so that the stability and other performances of the circuit are affected.

Disclosure of Invention

The embodiment of the invention provides a radio frequency amplifying circuit and a radio frequency front end module, so that the radio frequency amplifying circuit can achieve gain flattening and impedance matching, and the stability of the circuit is ensured.

The embodiment of the invention provides a radio frequency amplifying circuit, which comprises a first coupler, a second coupler, a first doherty power amplifier and a second doherty power amplifier, wherein the characteristics of the first doherty power amplifier and the second doherty power amplifier are the same;

the first coupler is configured to perform coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase;

the input end of the first doherty power amplifier is connected with the first output end of the first coupler and is configured to amplify the first radio frequency signal to generate a first amplified signal;

The input end of the second doherty power amplifier is connected with the second output end of the first coupler and is configured to amplify the second radio frequency signal to generate a second amplified signal, and the phase difference between the first amplified signal and the second amplified signal is 90 degrees;

the first input end of the second coupler is connected with the output end of the first doherty power amplifier, and the second input end of the second coupler is connected with the output end of the second doherty power amplifier and is configured to perform coupling processing on the first amplified signal and the second amplified signal to generate an output radio frequency signal.

Preferably, the radio frequency amplifying circuit further includes a signal separator connected to the first coupler and configured to perform signal separation on the first radio frequency signal and the second radio frequency signal, and generate a first carrier signal, a first peak signal, a second carrier signal, and a second peak signal;

the first doherty power amplifier is connected with the signal separator and is configured to amplify the first carrier signal and the first peak signal which are 90 degrees out of phase to generate a first amplified signal;

The second doherty power amplifier is connected to the signal separator and configured to amplify the second carrier signal and the second peak signal, which are 90 degrees out of phase, to generate a second amplified signal.

Preferably, the signal separator includes a third coupler and a fourth coupler;

the third coupler is connected with the first coupler and is configured to perform coupling processing on the first radio frequency signal to generate a first carrier signal and a first peak signal which are 90 degrees out of phase;

the fourth coupler is connected with the second coupler and is configured to perform coupling processing on the second radio frequency signal to generate a second carrier signal and a second peak signal, which are 90 degrees out of phase.

Preferably, the signal splitter comprises a power divider and a first differential circuit;

the power divider is connected with the first coupler and is configured to perform power division on the first radio frequency signal to generate a first carrier signal and a second carrier signal which are different in phase by 0 degrees;

the first differential circuit is connected with the second coupler and is configured to perform differential processing on the second radio frequency signal to generate a first peak signal and a second peak signal with 180 degrees of phase difference;

Or, the power divider is connected with the first coupler and configured to perform power division on the first radio frequency signal to generate a first peak signal and a second peak signal with a phase difference of 0 degrees;

the first differential circuit is connected with the second coupler and is configured to perform differential processing on the second radio frequency signal to generate a first carrier signal and a second carrier signal with 180 degrees of phase difference.

Preferably, the first differential circuit is a first balun.

Preferably, the first doherty power amplifier and the second doherty power amplifier each comprise a carrier amplifier, a peak amplifier and a combining circuit;

the carrier amplifier is connected with the signal separator and is configured to amplify an original carrier signal to generate an amplified carrier signal;

the peak amplifier is connected with the signal separator and is configured to amplify an original peak signal to generate an amplified peak signal;

the combining circuit is connected with the output end of the carrier amplifier and the output end of the peak amplifier and is configured to perform combination processing on the amplified carrier signal and the amplified peak signal to generate a target amplified signal;

The original carrier signal is a first carrier signal, the original peak signal is a first peak signal, and the target amplified signal is a first amplified signal; or the original carrier signal is a second carrier signal, the original peak signal is a second peak signal, and the target amplified signal is a second amplified signal.

Preferably, the first doherty power amplifier is any one of a current-type doherty power amplifier and a voltage-type doherty power amplifier;

the second doherty power amplifier is any one of a current-type doherty power amplifier and a voltage-type doherty power amplifier.

Preferably, the combining circuit in the current-type doherty power amplifier comprises a first phase shifting network;

the first phase shifting network is connected with the carrier amplifier and is configured to perform phase shifting processing on the amplified carrier signal and output a first phase shifting signal so that the phase of the first phase shifting signal is the same as that of the amplified peak signal;

the output end of the first phase shift network is connected with the output end of the carrier amplifier to form a signal combination node for generating a target amplified signal.

Preferably, the doherty power amplifier comprises 1 carrier amplifier and N peak amplifiers;

The combined circuit in the current type doherty power amplifier comprises N first phase shifting networks;

the input end of the 1 st first phase shift network is connected with the carrier amplifier, the output end of the 1 st first phase shift network is connected with the output end of the 1 st peak amplifier to form a 1 st signal combination node, the 1 st first phase shift signal is generated by carrying out phase shift processing on an amplified carrier signal output by the carrier amplifier, and the 1 st first phase shift signal and the amplified peak signal output by the 1 st peak amplifier are in the same phase, so that the 1 st signal combination node generates a 1 st first combination signal;

the input end of the ith first phase shifting network is connected with the ith-1 signal combination node, the output end of the ith first phase shifting network is connected with the output end of the ith peak amplifier to form the ith signal combination node, the ith first phase shifting network is configured to carry out phase shifting treatment on a first combination signal output by the ith-1 signal combination node to generate an ith first phase shifting signal, and the phase of the ith first phase shifting signal is identical with that of an amplified peak signal output by the ith peak amplifier so that the ith signal combination node generates an ith first combination signal;

Wherein N is more than or equal to 2, i is more than or equal to 2 and less than or equal to N, and the Nth first combined signal is a target amplified signal.

Preferably, the combining circuit in the voltage type doherty power amplifier comprises a second phase shifting network and a second differential circuit;

the second phase shifting network is connected with the peak amplifier and is configured to perform phase shifting processing on the amplified peak signal and output a second phase shifting signal so as to enable the phase of the second phase shifting signal to be 180 degrees different from that of the amplified carrier signal;

the second differential circuit is connected with the carrier amplifier and the second phase shift network and is configured to convert and synthesize the amplified carrier signal and the second phase shift signal to generate the target amplified signal.

the combined circuit in the voltage type doherty power amplifier comprises N second phase shifting networks and N second differential circuits;

the 1 st second phase shift network is connected with the 1 st peak amplifier and is configured to perform phase shift processing on the amplified peak signal output by the 1 st peak amplifier and output a 1 st second phase shift signal so that the 1 st second phase shift signal is 180 degrees different from the amplified carrier signal output by the 1 st carrier amplifier;

The input end of the 1 st second differential circuit is connected with the 1 st carrier amplifier and the 1 st second phase shift network and is configured to convert and synthesize an amplified carrier signal output by the carrier amplifier and the 1 st second phase shift signal to generate a 1 st differential synthesized signal;

the ith second phase shifting network is connected with the ith peak amplifier and is configured to perform phase shifting processing on the amplified peak signal output by the ith peak amplifier and output the ith second phase shifting signal so that the ith second phase shifting signal is 180 degrees out of phase with the ith-1 differential composite signal;

the input end of the ith second differential circuit is connected with the ith-1 second differential circuit and the ith second phase shift network and is configured to convert and synthesize the ith-1 differential synthesized signal and the ith second phase shift signal to generate an ith differential synthesized signal;

wherein N is more than or equal to 2, i is more than or equal to 2 and less than or equal to N, and the N-th differential synthesized signal is the target amplified signal.

Preferably, the second differential circuit is a second balun.

The embodiment of the invention provides a radio frequency front end module, which comprises the radio frequency amplifying circuit.

The embodiment of the invention provides electronic equipment, which comprises the radio frequency amplifying circuit or the radio frequency front-end module.

The radio frequency amplifying circuit and the radio frequency front end module adopt a first coupler to carry out coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees in phase difference; amplifying the first radio frequency signal and the second radio frequency signal by adopting two doherty power amplifiers with the same characteristics so as to ensure the gain flatness and linearity of the generated first amplified signal and second amplified signal; and finally, coupling the first amplified signal and the second amplified signal with the phase difference of 90 degrees by adopting a second coupler to generate an output radio frequency signal, and utilizing the phase characteristics of the couplers to enable the reflected signals of the two doherty power amplifiers with the same characteristics to be absorbed at the input end of the second coupler so as to avoid the influence of impedance mismatch on the radio frequency amplifying circuit, thereby achieving the aim of better impedance matching and further improving the stability and tolerance of the radio frequency amplifying circuit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an RF amplifier circuit according to an embodiment of the invention;

FIG. 2 is a schematic diagram of an RF amplifying circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an RF amplifying circuit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an RF amplifying circuit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an RF amplifying circuit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a doherty power amplifier according to an embodiment of the invention;

FIG. 7 is another schematic circuit diagram of a doherty power amplifier according to an embodiment of the invention;

FIG. 8 is another schematic circuit diagram of a doherty power amplifier according to an embodiment of the invention;

fig. 9 is another schematic circuit diagram of a doherty power amplifier according to an embodiment of the invention;

FIG. 10 is another schematic circuit diagram of a doherty power amplifier according to an embodiment of the invention;

fig. 11 is another circuit schematic of a doherty power amplifier in accordance with an embodiment of the invention.

In the figure: 1. a first coupler; 2. a second coupler; 3. a first doherty power amplifier; 4. a second doherty power amplifier; 5. a signal separator; 51. a third coupler; 52. a fourth coupler; 53. a power divider; 54. a first differential circuit; 61. a carrier amplifier; 62. a peak amplifier; 63. a combining circuit; 631. a first phase shifting network; 632. a second phase shifting network; 633. a second differential circuit; u1, a second balun.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.

It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.

Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In the following description, for the purpose of providing a thorough understanding of the present invention, detailed structures and steps are presented in order to illustrate the technical solution presented by the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

The embodiment of the invention provides a radio frequency amplifying circuit, as shown in fig. 1, the radio frequency amplifying circuit comprises a first coupler 1, a second coupler 2, a first doherty power amplifier 3 and a second doherty power amplifier 4, wherein the characteristics of the first doherty power amplifier 3 and the second doherty power amplifier 4 are the same; a first coupler 1 configured to perform coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase; the input end of the first doherty power amplifier 3 is connected with the first output end of the first coupler 1 and is configured to amplify the first radio frequency signal to generate a first amplified signal; the input end of the second doherty power amplifier 4 is connected with the second output end of the first coupler 1 and is configured to amplify the second radio frequency signal to generate a second amplified signal, and the phase difference between the first amplified signal and the second amplified signal is 90 degrees; the first input of the second coupler 2 is connected to the output of the first doherty power amplifier 3, and the second input of the second coupler 2 is connected to the output of the second doherty power amplifier 4, and is configured to couple the first amplified signal and the second amplified signal to generate an output radio frequency signal.

The first coupler 1 and the second coupler 2 are devices for realizing signal coupling processing. The first doherty power amplifier 3 and the second doherty power amplifier 4 are doherty power amplifiers for realizing signal amplification processing. The doherty power amplifier includes a carrier amplifier 61 and a peak amplifier 62, and when its output power is at a lower power level, only the carrier amplifier 61 is used for amplification, and when its output power is at a higher power level (e.g., after reaching the peak saturation point of the carrier amplifier 61), the carrier amplifier 61 and the peak amplifier 62 are used together for amplification processing, so as to ensure the gain flatness and linearity of the circuit. In this example, the first doherty power amplifier 3 and the second doherty power amplifier 4 with the same characteristics are arranged in parallel between the first coupler 1 and the second coupler 2, so that the formed radio frequency amplifying circuit accords with the characteristics of a balanced amplifier, the reflected signals of the two doherty power amplifiers can be absorbed by the input end of the second coupler 2, the stability of the two doherty power amplifiers is improved, and the input matching and/or the output matching of the radio frequency amplifying circuit are ensured.

As an example, the first coupler 1 is connected to the signal input end, and can perform coupling processing on the input radio frequency signal transmitted by the signal input end, so as to form a first radio frequency signal and a second radio frequency signal with 90 degrees phase difference. The input end of the first doherty power amplifier 3 is connected to the first output end of the first coupler 1, and is capable of receiving the first radio frequency signal output by the first coupler 1, and when the first radio frequency signal is at a lower power level, the carrier amplifier 61 is used for amplifying, and when the first radio frequency signal is at a higher power level, the carrier amplifier 61 and the peak amplifier 62 are used for amplifying simultaneously to generate a first amplified signal, so that the gain flatness and linearity of the first amplified signal are ensured. The input end of the second doherty power amplifier 4 is connected to the second output end of the first coupler 1, and is capable of receiving the second radio frequency signal output by the first coupler 1, and when the second radio frequency signal is at a lower power level, the second radio frequency signal is amplified by the carrier amplifier 61, and when the second radio frequency signal is at a higher power level, the second radio frequency signal is amplified by the carrier amplifier 61 and the peak amplifier 62 at the same time, so as to generate a second amplified signal, thereby ensuring the gain flatness and linearity of the second amplified signal. Because the phase difference of the first radio frequency signal and the second radio frequency signal is 90 degrees, the first doherty power amplifier 3 and the second doherty power amplifier 4 are adopted to amplify the first radio frequency signal and the second radio frequency signal respectively, so that the phase difference of the generated first amplified signal and the generated second amplified signal is 90 degrees. The first input end of the second coupler 2 is connected with the output end of the first doherty power amplifier 3, the second input end of the second coupler 2 is connected with the output end of the second doherty power amplifier 4, and the first amplified signal and the second amplified signal which are 90 degrees out of phase can be coupled to generate an output radio frequency signal. In this example, the second coupler 2 may re-couple the first amplified signal output by the first doherty power amplifier 3 and the second amplified signal output by the second doherty power amplifier 4 together, and due to the phase characteristics of the couplers, the reflected signals from the first doherty power amplifier 3 and the second doherty power amplifier 4 are absorbed at the input end of the second coupler 2, so as to improve the stability of each doherty power amplifier and ensure the input matching and/or the output matching of the radio frequency amplifying circuit, so as to avoid the influence of impedance mismatch on the radio frequency amplifying circuit, achieve the purpose of better impedance matching, and further improve the stability and tolerance of the radio frequency amplifying circuit.

In the radio frequency amplifying circuit provided by the embodiment, the first coupler 1 is adopted to carry out coupling processing on an input radio frequency signal, and a first radio frequency signal and a second radio frequency signal with 90-degree phase difference are generated; amplifying the first radio frequency signal and the second radio frequency signal by adopting two doherty power amplifiers to ensure the gain flatness and linearity of the generated first amplified signal and second amplified signal; finally, the second coupler 2 is adopted to carry out coupling treatment on the first amplified signal and the second amplified signal with the phase difference of 90 degrees, an output radio frequency signal is generated, the phase characteristics of the couplers are utilized to enable the reflected signals of the two doherty power amplifiers to be absorbed at the input end of the second coupler 2, so that the influence of impedance mismatch on a radio frequency amplifying circuit is avoided, the aim of better impedance matching is achieved, and the stability and the tolerance of the radio frequency amplifying circuit are further improved.

In an embodiment, as shown in fig. 2, the radio frequency amplifying circuit further includes a signal separator 5, where the signal separator 5 is connected to the first coupler 1 and configured to perform signal separation on the first radio frequency signal and the second radio frequency signal, and generate a first carrier signal, a first peak signal, a second carrier signal, and a second peak signal; a first doherty power amplifier 3 connected to the signal separator 5 and configured to amplify the first carrier signal and the first peak signal, which are 90 degrees out of phase, to generate a first amplified signal; the second doherty power amplifier 4 is connected to the signal separator 5 and configured to amplify the second carrier signal and the second peak signal, which are 90 degrees out of phase, to generate a second amplified signal.

As an example, the radio frequency amplifying circuit further includes a signal separator 5, where the signal separator 5 is connected to the first output end and the second output end of the first coupler 1, and can perform signal separation processing on the first radio frequency signal and the second radio frequency signal that are output by the first coupler 1 and have 90 degrees phase difference, so as to generate four radio frequency signals, where the four radio frequency signals include one set of a first carrier signal and a first peak signal that are 90 degrees phase difference, and another set of a second carrier signal and a second peak signal that are 90 degrees phase difference.

As an example, the first doherty power amplifier 3 is connected to the first output terminal and the second output terminal of the signal splitter 5, and may receive the first carrier signal and the first peak signal, which are phase-shifted by 90 degrees, output from the signal splitter 5, and amplify the first carrier signal with the carrier amplifier 61 when the output power is at a lower power level, and amplify the first carrier signal with the carrier amplifier 61 and amplify the first peak signal with the peak amplifier 62 when the output power is at a higher power level, so as to generate a first amplified signal, thereby ensuring the gain flatness and linearity of the first amplified signal.

As an example, the second doherty power amplifier 4 is connected to the third output terminal and the fourth output terminal of the signal splitter 5, and may receive the second carrier signal and the second peak signal, which are phase-shifted by 90 degrees, output from the signal splitter 5, and amplify the second carrier signal with the carrier amplifier 61 when the output power is at a lower power level, and amplify the second carrier signal with the carrier amplifier 61 and amplify the second peak signal with the peak amplifier 62 when the output power is at a higher power level, so as to generate a second amplified signal, thereby ensuring the gain flatness and linearity of the second amplified signal.

In an embodiment, as shown in fig. 3, the signal separator 5 includes a third coupler 51 and a fourth coupler 52; a third coupler 51 connected to the first coupler 1 and configured to perform coupling processing on the first radio frequency signal to generate a first carrier signal and a first peak signal which are 90 degrees out of phase; and a fourth coupler 52 connected to the second coupler 2 and configured to perform coupling processing on the second radio frequency signal to generate a second carrier signal and a second peak signal which are 90 degrees out of phase.

The third coupler 51 and the fourth coupler 52 are devices for implementing signal coupling processing, and can perform differential processing on one path of signal to form two paths of signals with 90-degree phase difference.

As an example, as shown in fig. 3, the first coupler 1 performs coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase. The input end of the third coupler 51 is connected to the first output end of the first coupler 1, and performs coupling processing on the first radio frequency signal output by the first coupler 1, so as to generate a first carrier signal and a first peak signal with 90 degrees phase difference, so that the doherty power amplifier is used for amplification processing. Correspondingly, the input end of the fourth coupler 52 is connected with the first output end of the first coupler 1, and the second radio frequency signal output by the first coupler 1 is subjected to coupling processing, so that a second carrier signal and a second peak signal with 90 degrees of phase difference are generated, and the second carrier signal and the second peak signal are subjected to amplification processing by a doherty power amplifier. For example, in the first radio frequency signal and the second radio frequency signal generated by the first coupler 1, the phases of the first radio frequency signal and the second radio frequency signal are different by 90 degrees, the phase of the first radio frequency signal is 90 degrees, and the phase of the second radio frequency signal is 0 degrees; the third coupler 51 performs coupling processing on a first radio frequency signal with a phase of 90 degrees, the phase of the generated first carrier signal is 90 degrees, the phase of the first peak signal is 180 degrees, and the phases are different by 90 degrees; the fourth coupler 52 couples the second rf signal with a phase of 0 degrees, and generates a second carrier signal with a phase of 0 degrees and a phase of-90 degrees, which are different by 90 degrees.

In this example, the first output terminal of the third coupler 51 is connected to the first input terminal of the first doherty power amplifier 3, the second output terminal of the third coupler 51 is connected to the second input terminal of the first doherty power amplifier 3, and the first carrier signal and the first peak signal, which are 90 degrees out of phase, are output to the first doherty power amplifier 3, so that the first doherty power amplifier 3 performs coupling processing on the first carrier signal and the first peak signal to generate a first amplified signal, so as to ensure gain flatness and linearity of the first amplified signal. Accordingly, the first output terminal of the fourth coupler 52 is connected to the first input terminal of the second doherty power amplifier 4, the second output terminal of the fourth coupler 52 is connected to the second input terminal of the second doherty power amplifier 4, and the second carrier signal and the second peak signal, which are 90 degrees out of phase, are output to the second doherty power amplifier 4, so that the second doherty power amplifier 4 performs coupling processing on the second carrier signal and the second peak signal to generate a second amplified signal, so as to ensure gain flatness and linearity of the second amplified signal.

In an embodiment, as shown in fig. 4, the signal splitter 5 comprises a power divider 53 and a first differential circuit 54; a power divider 53 connected to the first coupler 1 and configured to divide power of the first rf signal to generate a first carrier signal and a second carrier signal having a phase difference of 0 degrees; the first differential circuit 54 is connected to the second coupler 2 and is configured to perform differential processing on the second radio frequency signal to generate a first peak signal and a second peak signal which are 180 degrees out of phase.

The power divider 53 is a device for implementing power division processing, and can divide power for one signal to form two signals with the same phase. The first differential circuit 54 is configured to perform differential processing on signals, and may perform differential processing on one signal to form two signals with 180 degrees phase difference.

As an example, as shown in fig. 4, the first coupler 1 performs coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase. The input end of the power divider 53 is connected to the first output end of the first coupler 1, and performs power division on the first radio frequency signal output by the first coupler 1, so as to generate a first carrier signal and a second carrier signal with a phase difference of 0 degrees, so that the doherty power amplifier is used for amplifying. Correspondingly, the input end of the first differential circuit 54 is connected with the first output end of the first coupler 1, and differential processing is performed on the second radio frequency signal output by the first coupler 1, so as to generate a second peak signal and a second peak signal with 180 degrees of phase difference, so that the doherty power amplifier is used for amplifying later. For example, in the first radio frequency signal and the second radio frequency signal generated by the first coupler 1, the phases of the first radio frequency signal and the second radio frequency signal are different by 90 degrees, the phase of the first radio frequency signal is 90 degrees, and the phase of the second radio frequency signal is 0 degrees; the power divider 53 performs power division on a first radio frequency signal with a phase of 90 degrees, the phase of the generated first carrier signal is 90 degrees, the phase of the generated second carrier signal is 90 degrees, and the phase difference between the generated first carrier signal and the generated second carrier signal is 0 degrees; the first differential circuit 54 performs differential processing on a second radio frequency signal having a phase of 0 degrees, and generates a first peak signal having a phase of 0 degrees and a second peak signal having a phase of 180 degrees, which are 180 degrees different from each other.

In this example, a first output terminal of the power divider 53 is connected to a first input terminal of the first doherty power amplifier 3, a first output terminal of the first differential circuit 54 is connected to a second input terminal of the first doherty power amplifier 3, and a first carrier signal (90 degrees) and a first peak signal (0 degrees) which are 90 degrees out of phase are output to the first doherty power amplifier 3, so that the first doherty power amplifier 3 amplifies the first carrier signal and the first peak signal to generate a first amplified signal to ensure gain flatness and linearity of the first amplified signal. Accordingly, the second output terminal of the power divider 53 is connected to the first input terminal of the second doherty power amplifier 4, the second output terminal of the first differential circuit 54 is connected to the second input terminal of the second doherty power amplifier 4, and the second carrier signal (90 degrees) and the second peak signal (180 degrees) which are 90 degrees out of phase are output to the second doherty power amplifier 4, so that the second doherty power amplifier 4 amplifies the second carrier signal and the second peak signal to generate a second amplified signal to ensure the gain flatness and linearity of the second amplified signal.

In one embodiment, the first differential circuit 54 is a first balun, an input end of the first balun is connected to the signal splitter 5, and two output ends of the first balun are respectively connected to the first doherty power amplifier 3 and the second doherty power amplifier 4, so as to perform differential processing on the second radio frequency signal output by the signal splitter 5, and generate two radio frequency signals with 180 degrees phase difference. The first balun is adopted as the first differential circuit 54, and has the characteristics of simple structure and low cost.

In an embodiment, as shown in fig. 5, the signal splitter 5 includes a power divider 53 and a first differential circuit 54; a power divider 53 connected to the first coupler 1 and configured to divide power of the first rf signal to generate a first peak signal and a second peak signal having a phase difference of 0 degrees; the first differential circuit 54 is connected to the second coupler 2 and is configured to perform differential processing on the second radio frequency signal, and generate a first carrier signal and a second carrier signal that are 180 degrees out of phase.

As an example, as shown in fig. 5, the first coupler 1 performs coupling processing on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase. The input end of the power divider 53 is connected to the first output end of the first coupler 1, and performs power division on the first radio frequency signal output by the first coupler 1, so as to generate a first peak signal and a second peak signal with a phase difference of 0 degrees, so that the doherty power amplifier is used for amplifying. Correspondingly, the input end of the first differential circuit 54 is connected with the first output end of the first coupler 1, and performs differential processing on the second radio frequency signal output by the first coupler 1, so as to generate a first carrier signal and a second carrier signal with 180 degrees of phase difference, so that the subsequent amplification processing is performed by adopting a doherty power amplifier. For example, in the first radio frequency signal and the second radio frequency signal generated by the first coupler 1, the phases of the first radio frequency signal and the second radio frequency signal are different by 90 degrees, the phase of the first radio frequency signal is 0 degrees, and the phase of the second radio frequency signal is 90 degrees; the power divider 53 performs power division on a first radio frequency signal with a phase of 0 degrees, and generates a first peak signal with a phase of 0 degrees and a second peak signal with a phase of 0 degrees, which are different by 0 degrees; the first differential circuit 54 performs differential processing on a second radio frequency signal having a phase of 90 degrees, and generates a first carrier signal having a phase of 90 degrees and a second carrier signal having a phase of-90 degrees, which are 180 degrees out of phase.

In this example, a first output terminal of the power divider 53 is connected to a first input terminal of the first doherty power amplifier 3, a first output terminal of the first differential circuit 54 is connected to a second input terminal of the first doherty power amplifier 3, and a first carrier signal (90 degrees) and a first peak signal (0 degrees) which are 90 degrees out of phase are output to the first doherty power amplifier 3, so that the first doherty power amplifier 3 amplifies the first carrier signal and the first peak signal to generate a first amplified signal to ensure gain flatness and linearity of the first amplified signal. Accordingly, the second output terminal of the power divider 53 is connected to the first input terminal of the second doherty power amplifier 4, the second output terminal of the first differential circuit 54 is connected to the second input terminal of the second doherty power amplifier 4, and the second carrier signal (-90 degrees) and the second peak signal (0 degrees) which are 90 degrees out of phase are output to the second doherty power amplifier 4, so that the second doherty power amplifier 4 amplifies the second carrier signal and the second peak signal to generate a second amplified signal to ensure the gain flatness and linearity of the second amplified signal.

In one embodiment, as shown in fig. 6, the first doherty power amplifier 3 and the second doherty power amplifier 4 each include a carrier amplifier 61, a peak amplifier 62, and a combining circuit 63; a carrier amplifier 61 connected to the demultiplexer 5 and configured to amplify the original carrier signal to generate an amplified carrier signal; a peak amplifier 62 connected to the demultiplexer 5 and configured to amplify the original peak signal to generate an amplified peak signal; a combining circuit 63 connected to the output terminal of the carrier amplifier 61 and the output terminal of the peak amplifier 62, configured to perform a combination process on the amplified carrier signal and the amplified peak signal to generate a target amplified signal; the original carrier signal is a first carrier signal, the original peak signal is a first peak signal, and the target amplified signal is a first amplified signal; or the original carrier signal is a second carrier signal, the original peak signal is a second peak signal, and the target amplified signal is a second amplified signal.

The original carrier signal refers to a carrier signal received by the doherty power amplifier. The original peak signal is the peak signal received by the doherty power amplifier. The target amplified signal is an amplified signal output by the doherty power amplifier. As an example, in the first doherty power amplifier 3, the original carrier signal is the first carrier signal, the original peak signal is the first peak signal, and the target amplified signal is the first amplified signal; in the second doherty power amplifier 4, the original carrier signal is the second carrier signal, the original peak signal is the second peak signal, and the target amplified signal is the second amplified signal.

As an example, the input terminal of the signal separator 5 is coupled to the first coupler 1, and the two output terminals of the signal separator 5 are connected to the carrier amplifier 61 and the peak amplifier 62, respectively, to output the original carrier signal to the carrier amplifier 61 and the original peak signal to the peak amplifier 62. In the first doherty power amplifier 3, the original carrier signal is a first carrier signal, and the original peak signal is a first peak signal; in the second doherty power amplifier 4, the original carrier signal is the second carrier signal.

As an example, the input terminal of the carrier amplifier 61 is coupled to an output terminal of the demultiplexer 5, and may amplify the original carrier signal output by the demultiplexer 5 to generate an amplified carrier signal. The amplified carrier signal is a radio frequency signal amplified by the original carrier signal.

As an example, the input terminal of the peak amplifier 62 is coupled to the other output terminal of the signal splitter 5, and when the output power of the carrier amplifier 61 reaches the saturation power, the peak amplifier 62 starts to operate, and amplifies the original peak signal output from the signal splitter 5 to generate an amplified peak signal. The amplified peak signal is a radio frequency signal amplified from the original peak signal.

In this example, when the output power of the carrier amplifier 61 is small, only the carrier amplifier 61 is operated, and when the output power of the carrier amplifier 61 reaches the peak saturation region, the peak amplifier 62 and the carrier amplifier 61 are operated together, and since the original carrier signal and the original peak signal are radio frequency signals having a phase difference of 90 degrees, after the carrier amplifier 61 and the peak amplifier 62 amplify the original carrier signal and the original peak signal, respectively, the amplified carrier signal and the amplified peak signal formed by the carrier amplifier 61 and the peak amplifier 62 are radio frequency signals having a phase difference of 90 degrees.

As an example, two input terminals of the combining circuit 63 are coupled to the output terminal of the carrier amplifier 61 and the output terminal of the peak amplifier 62, respectively, and the amplified carrier signal output from the carrier amplifier 61 and the amplified peak signal output from the peak amplifier 62 may be combined to generate the target amplified signal. In the first doherty power amplifier 3, the target amplified signal is a first amplified signal; in the second doherty power amplifier 4, the target amplified signal is a second amplified signal.

In an embodiment, the first doherty power amplifier 3 is any one of a current-type doherty power amplifier and a voltage-type doherty power amplifier; the second doherty power amplifier 4 is any one of a current-type doherty power amplifier and a voltage-type doherty power amplifier.

The current type doherty power amplifier is a doherty power amplifier in which the phase of the amplified carrier signal and/or the amplified peak signal is shifted by the combining circuit 63 and the phases of the two signals are identical. As an example, the combining circuit 63 in the current type doherty power amplifier is configured to be connected to the carrier amplifier 61 and the peak amplifier 62, and may perform a phase shift process on the amplified carrier signal output by the carrier amplifier 61 and/or the amplified peak signal output by the peak amplifier 62, so that the phase of the phase-shifted amplified carrier signal and the phase of the amplified peak signal are the same, and may directly perform current superposition to generate the target amplified signal.

The voltage type doherty power amplifier is a doherty power amplifier that is synthesized by shifting the phase of the amplified carrier signal and/or the amplified peak signal by the combining circuit 63, and then the two signals have different phases. As an example, the combining circuit 63 in the voltage doherty power amplifier is configured to be connected to the carrier amplifier 61 and the peak amplifier 62, and may perform phase shift processing on the amplified carrier signal output by the carrier amplifier 61 and/or the amplified peak signal output by the peak amplifier 62, so that the phase of the phase-shifted amplified carrier signal and the phase of the amplified peak signal are different, and the second differential circuit 633 needs to be additionally provided between the two output ends to perform differential conversion synthesis, so as to generate the target amplified signal.

As an example, the first doherty power amplifier 3 and the second doherty power amplifier 4 may be both current-type doherty power amplifiers, voltage-type doherty power amplifiers, and current-type doherty power amplifiers and voltage-type doherty power amplifiers, respectively, and may be autonomously set according to actual requirements.

In one embodiment, as shown in fig. 7, the combining circuit 63 in the current-type doherty power amplifier includes a first phase shifting network 631; a first phase shift network 631 connected to the carrier amplifier 61 and configured to perform a phase shift process on the amplified carrier signal and output a first phase shift signal such that the first phase shift signal has the same phase as the amplified peak signal; an output of the first phase shift network 631 is coupled to an output of the carrier amplifier 61 to form a signal combining node for generating the target amplified signal.

The first phase shift network 631 is a network provided in the current type doherty power amplifier for achieving phase shift. The first phase shifting network 631 may employ, but is not limited to, capacitive and inductive elements, and a network formed in series and/or parallel to implement a phase shifting function.

As an example, the combining circuit 63 in the current type doherty power amplifier is a first phase shift network 631, and an input terminal of the first phase shift network 631 is coupled to an output terminal of the carrier amplifier 61, and is configured to perform phase shift processing on an amplified carrier signal output by the carrier amplifier 61, and output a first phase shift signal, such that the first phase shift signal is 90 degrees out of phase with the amplified carrier signal, and the first phase shift signal is the same as the amplified peak signal in phase. In this example, the output of the first phase shift network 631 is coupled to the output of the carrier amplifier 61 to form a signal combining node that processes the first phase shifted signal and the amplified peak signal to generate the target amplified signal. Understandably, since the first phase-shifted signal and the amplified peak signal have the same phase, the first phase-shifted signal and the amplified peak signal can be directly subjected to current superposition to generate the target amplified signal.

In one embodiment, as shown in FIG. 8, the doherty power amplifier comprises 1 carrier amplifier 61 and N peak amplifiers 621/622/62N; the combining circuit 63 in the current-mode doherty power amplifier includes N first phase shifting networks 6311/6312/631N; the input end of the 1 st first phase shift network 6311 is connected with the carrier amplifier 61, the output end of the 1 st first phase shift network 6311 is connected with the output end of the 1 st peak amplifier 62 to form a 1 st signal combination node, and the 1 st first phase shift network 6311 is configured to perform phase shift processing on the amplified carrier signal output by the carrier amplifier 61 to generate a 1 st first phase shift signal, so that the 1 st first phase shift signal and the amplified peak signal output by the 1 st peak amplifier 62 have the same phase, and the 1 st signal combination node generates a 1 st first combination signal; the input end of the ith first phase shifting network 6312/631n is connected with the ith-1 signal combining node, the output end of the ith first phase shifting network 6312/631n is connected with the output end of the ith peak amplifier 622/62n to form the ith signal combining node, the ith first phase shifting network is configured to perform phase shifting processing on the first combined signal output by the ith-1 signal combining node to generate an ith first phase shifting signal, and the phase of the ith first phase shifting signal is identical to that of the amplified peak signal output by the ith peak amplifier 622/62n, so that the ith signal combining node generates an ith first combined signal; wherein N is more than or equal to 2, i is more than or equal to 2 and less than or equal to N, and the Nth first combined signal is a target amplified signal.

As an example, the doherty power amplifier comprises 1 carrier amplifier 61 and N peak amplifiers 621/622/62N, N.gtoreq.2, and correspondingly, the combining circuit 63 in the current-mode doherty power amplifier comprises N first phase shifting networks 6311/6312/631N. In this example, the output terminal of the signal splitter 5 is coupled to the input terminal of the 1 carrier amplifier 61 and the input terminals of the N peak amplifiers 621/622/62N, and performs signal splitting on the input radio frequency signal to form 1 original carrier signal and N original peak signals, where the phases of the 1 original carrier signal and the N original peak signals are different. For example, when the doherty power amplifier is provided with 3 peak amplifiers 62, the original carrier signal and the 1 st original peak signal are out of phase by 30 degrees, the original carrier signal and the 2 nd original peak signal are out of phase by 60 degrees, the original carrier signal and the 3 rd original peak signal are out of phase by 90 degrees, the original carrier signal is set to 0 degrees, and the phases of the 3 original peak signals are sequentially 30 degrees, 60 degrees, and 90 degrees.

The input end of the 1 st first phase shift network 6311 is coupled to the output end of the carrier amplifier 61, the output end of the 1 st first phase shift network 6311 is coupled to the output end of the 1 st peak amplifier 621 to form a 1 st signal combining node, and the 1 st first phase shift network 6311 is configured to perform phase shift processing on the amplified carrier signal output by the carrier amplifier 61 to generate a 1 st first phase shift signal, so that the 1 st first phase shift signal and the amplified peak signal output by the 1 st peak amplifier 621 have the same phase, and the 1 st signal combining node performs current superposition on the first phase shift signal and the 1 st amplified peak signal to generate a 1 st first combined signal.

The input end of the ith first phase shifting network 6312/631n is coupled to the ith-1 signal combining node, the output end of the ith first phase shifting network 6312/631n is coupled to the output end of the ith peak amplifier 622/62n to form the ith signal combining node, the ith first phase shifting network is configured to perform phase shifting processing on the first combined signal output by the ith-1 signal combining node to generate the ith first phase shifting signal, the phase of the ith first phase shifting signal is identical to the phase of the amplified peak signal output by the ith peak amplifier 622/62n, so that the ith first phase shifting signal and the ith amplified peak signal are subjected to current superposition by the ith signal combining node to generate the ith first combined signal, and when the ith signal combining node is the last signal combining node, the generated ith first combined signal is the target amplified signal of the current type doherty power amplifier.

Understandably, the signal separator 5 separates the input radio frequency signal into 1 original carrier signal and N original peak signals, and outputs the 1 carrier amplifier 61 and N peak amplifiers 621/622/62N, respectively; the carrier amplifier 61 amplifies the original carrier signal and outputs an amplified carrier signal; n peak amplifiers 621/622/62N amplify the N original peak signals respectively and output N amplified peak signals respectively; and then N first phase shift networks 6311/6312/631N are adopted to carry out phase shift processing to form N first phase shift signals, and the N first phase shift signals and N amplified peak signals are combined to generate a target amplified signal, so that the target amplified signal is amplified and combined for more times, and the performance is better.

In one embodiment, as shown in fig. 9, the combining circuit 63 in the voltage type doherty power amplifier includes a second phase shift network 632 and a second differential circuit 633; a second phase shift network 632, coupled to the peak amplifier 62, configured to phase shift the amplified peak signal and output a second phase shifted signal such that the second phase shifted signal is 180 degrees out of phase with the amplified carrier signal; the second differential circuit 633, connected to the carrier amplifier 61 and the second phase shift network 632, is configured to convert and synthesize the amplified carrier signal and the second phase shift signal to generate a target amplified signal.

The second phase shift network 632 is a network provided in the voltage type doherty power amplifier for achieving phase shift. The second phase shifting network 632 may employ, but is not limited to, capacitive and inductive elements, a network formed in series and/or parallel to perform a phase shifting function. The second differential circuit 633 is a circuit provided in the combination circuit 63 of the voltage type doherty power amplifier for performing differential processing on two signals to form one signal output.

As an example, the combining circuit 63 in the voltage type doherty power amplifier includes a second phase shift network 632 and a second differential circuit 633. An input terminal of the second phase shift network 632 is coupled to the output terminal of the peak amplifier 62, and is configured to perform phase shift processing on the amplified peak signal output by the peak amplifier 62, and output a second phase shift signal, such that the second phase shift signal is 90 degrees out of phase with the amplified peak signal, and the second phase shift signal is 180 degrees out of phase with the amplified carrier signal. In this example, two input terminals of the second differential circuit 633 are coupled to the output terminal of the carrier amplifier 61 and the output terminal of the second phase shift network 632, respectively, and one output terminal of the second differential circuit 633 is a signal output terminal RFOUT of the voltage type doherty power amplifier, for performing differential processing on an amplified carrier signal and a second phase shift signal, which are 180 degrees out of phase, to generate a target amplified signal.

In one embodiment, as shown in FIG. 10, the doherty power amplifier comprises 1 carrier amplifier 61 and N peak amplifiers 621/622/62N; the combining circuit 63 in the voltage type doherty power amplifier includes N second phase shift networks 6321/6322/632N and N second differential circuits 6331/6332/633N; the 1 st second phase shift network 6321 is connected to the 1 st peak amplifier 62 and configured to perform phase shift processing on the amplified peak signal output from the 1 st peak amplifier 62 and output the 1 st second phase shift signal so as to make the 1 st second phase shift signal 180 degrees different from the amplified carrier signal output from the 1 st carrier amplifier 61; the input end of the 1 st second differential circuit 633 is connected to the 1 st carrier amplifier 61 and the 1 st second phase shift network 6321, and is configured to convert and synthesize the amplified carrier signal output by the carrier amplifier 61 and the 1 st second phase shift signal, so as to generate a 1 st differential synthesized signal; the ith second phase shift network 6322/632n is connected to the ith peak amplifier 622/62n and configured to perform phase shift processing on the amplified peak signal output by the ith peak amplifier 622/62n, and output the ith second phase shift signal such that the ith second phase shift signal is 180 degrees out of phase with the ith-1 th differential composite signal; the input end of the ith second differential circuit 633 is connected to the ith-1 second differential circuit 633 and the ith second phase shift network 6322/632n, and is configured to perform conversion synthesis on the ith-1 differential synthesized signal and the ith second phase shift signal to generate an ith differential synthesized signal; wherein N is more than or equal to 2, i is more than or equal to 2 and less than or equal to N, and the N-th differential synthesized signal is a target amplified signal.

As an example, the doherty power amplifier comprises 1 carrier amplifier 61 and N peak amplifiers 621/622/62N, N.gtoreq.2, and correspondingly, the combining circuit 63 in the voltage type doherty power amplifier comprises N first phase shifting networks 6311/6312/631N. In this example, the output terminal of the signal splitter 5 is coupled to the input terminal of the 1 carrier amplifier 61 and the input terminals of the N peak amplifiers 621/622/62N, and performs signal splitting on the input radio frequency signal to form 1 original carrier signal and N original peak signals, where the phases of the 1 original carrier signal and the N original peak signals are different. For example, when the doherty power amplifier is provided with 3 peak amplifiers 62, the original carrier signal and the 1 st original peak signal are out of phase by 30 degrees, the original carrier signal and the 2 nd original peak signal are out of phase by 60 degrees, the original carrier signal and the 3 rd original peak signal are out of phase by 90 degrees, the original carrier signal is set to 0 degrees, and the phases of the 3 original peak signals are sequentially 30 degrees, 60 degrees, and 90 degrees.

The 1 st second phase shift network 6321 has an input terminal coupled to the output terminal of the 1 st peak amplifier 621, and is configured to phase-shift the 1 st amplified peak signal output from the 1 st peak amplifier 621, and output the 1 st second phase shift signal so that the 1 st second phase shift signal is 180 degrees out of phase with the amplified carrier signal output from the carrier amplifier 61. The two input terminals of the 1 st second differential circuit 6331 are coupled to the output terminal of the carrier amplifier 61 and the output terminal of the 1 st second phase shift network 6321, respectively, and are configured to convert and synthesize two signals of the amplified carrier signal and the 1 st second phase shift signal, which are 180 degrees out of phase, output by the carrier amplifier 61, to generate a 1 st differential synthesized signal.

An input of the ith second phase shift network 6322/632n is coupled to an output of the ith peak amplifier 622/62n, and is configured to phase-shift the ith amplified peak signal output from the ith peak amplifier 622/62n, and output the ith second phase shift signal such that the ith second phase shift signal is 180 degrees out of phase with the ith-1 differential composite signal. Two input ends of the ith second differential circuit 6332/632n are respectively coupled to the output end of the ith-1 second differential circuit 6332/632n and the output end of the ith second phase shift network 6322/632n, and are configured to convert and synthesize two signals of the ith-1 differential synthesized signal and the ith second phase shift signal, which are 180 degrees different in phase, so as to generate an ith differential synthesized signal; the nth differential synthesized signal is a target amplified signal.

Understandably, the signal separator 5 separates the input radio frequency signal into 1 original carrier signal and N original peak signals, and outputs the 1 carrier amplifier 61 and N peak amplifiers 621/622/62N, respectively; the carrier amplifier 61 amplifies the original carrier signal and outputs an amplified carrier signal; n peak amplifiers 621/622/62N amplify the N original peak signals respectively and output N amplified peak signals respectively; and then N second phase shift networks 6321/6322/632N are adopted to carry out phase shift processing to form N second phase shift signals, and 1 amplified carrier signal and N second phase shift signals are converted and synthesized to generate a target amplified signal, so that the target amplified signal is amplified and combined for more times, and the performance is better.

In an embodiment, the second differential circuit 633 is a second balun U1.

As an example, in a voltage type doherty power amplifier, the combining circuit 63 thereof includes a second phase shift network 632 and a second differential circuit 633, where the second differential circuit 633 may be set as a second balun U1. That is, the signal separator 5 separates the input radio frequency signal, and outputs the original carrier signal and the original peak signal to the carrier amplifier 61 and the peak amplifier 62, respectively; an input terminal of the second phase shift network 632 is coupled to the output terminal of the peak amplifier 62, and performs phase shift processing on the amplified peak signal output by the peak amplifier 62, and outputs a second phase shift signal, so that the phase of the second phase shift signal is 180 degrees different from that of the amplified carrier signal output by the carrier amplifier 61; the two input terminals of the second balun U1 are coupled to the output terminal of the second phase shift network 632 and the output terminal of the carrier amplifier 61, respectively, and process the second phase shift signal and the amplified carrier signal, which are 180 degrees out of phase, to generate a target amplified signal. Understandably, the second balun U1 is used as the second differential circuit 633 to perform differential processing on the amplified carrier signal and the second phase-shifted signal, which are 180 degrees out of phase, to generate the target amplified signal, which has the characteristics of simple structure and low cost.

In an embodiment, a radio frequency front end module is provided, including the radio frequency amplifying circuit in the above embodiment.

The embodiment provides a radio frequency front end module, which can be a 4G network module, a 6G network module or other network modules, and comprises the radio frequency amplifying circuit in the above embodiment, wherein the radio frequency amplifying circuit adopts a first coupler 1 to perform coupling processing on an input radio frequency signal, and generates a first radio frequency signal and a second radio frequency signal which are different in phase by 90 degrees; amplifying the first radio frequency signal and the second radio frequency signal by adopting two doherty power amplifiers to ensure the gain flatness and linearity of the generated first amplified signal and second amplified signal; finally, the second coupler 2 is adopted to carry out coupling treatment on the first amplified signal and the second amplified signal with the phase difference of 90 degrees, an output radio frequency signal is generated, and the phase characteristics of the couplers are utilized to enable the reflection of the two doherty power amplifiers to be absorbed at the input end of the second coupler 2, so that the two doherty power amplifiers can work in an optimal state with flat gain, impedance matching can be considered, and the circuit stability is ensured.

In an embodiment, an electronic device is provided, which includes the rf amplifying circuit in the above embodiment, or includes the rf front-end module in the above embodiment.

The embodiment provides an electronic device, which includes the radio frequency amplifying circuit in the above embodiment, or includes the radio frequency front end module in the above embodiment, where the radio frequency front end module includes the radio frequency amplifying circuit in the above embodiment. The radio frequency amplifying circuit adopts a first coupler 1 to carry out coupling treatment on an input radio frequency signal to generate a first radio frequency signal and a second radio frequency signal which are 90 degrees out of phase; amplifying the first radio frequency signal and the second radio frequency signal by adopting two doherty power amplifiers to ensure the gain flatness and linearity of the generated first amplified signal and second amplified signal; finally, the second coupler 2 is adopted to carry out coupling treatment on the first amplified signal and the second amplified signal with the phase difference of 90 degrees, an output radio frequency signal is generated, and the phase characteristics of the couplers are utilized to enable the reflection of the two doherty power amplifiers to be absorbed at the input end of the second coupler 2, so that the two doherty power amplifiers can work in an optimal state with flat gain, impedance matching can be considered, and the circuit stability is ensured.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. A radio frequency amplifying circuit, comprising a first coupler, a second coupler, a first doherty power amplifier and a second doherty power amplifier, wherein the first doherty power amplifier and the second doherty power amplifier have the same characteristics;

the first input end of the second coupler is connected with the output end of the first doherty power amplifier, the second input end of the second coupler is connected with the output end of the second doherty power amplifier, and the second coupler is configured to perform coupling processing on the first amplified signal and the second amplified signal to generate an output radio frequency signal;

secondly, the radio frequency amplifying circuit further comprises a signal separator, wherein the signal separator is connected with the first coupler and is configured to perform signal separation on the first radio frequency signal and the second radio frequency signal to generate a first carrier signal, a first peak signal, a second carrier signal and a second peak signal;

2. The radio frequency amplification circuit of claim 1, wherein the signal splitter comprises a third coupler and a fourth coupler;

3. The radio frequency amplification circuit of claim 1, wherein the signal splitter comprises a power divider and a first differential circuit;

4. The radio frequency amplification circuit of claim 3, wherein the first differential circuit is a first balun.

5. The radio frequency amplification circuit of claim 1, wherein the first doherty power amplifier and the second doherty power amplifier each comprise a carrier amplifier, a peak amplifier, and a combining circuit;

6. The radio frequency amplification circuit of claim 5, wherein the first doherty power amplifier is any one of a current-type doherty power amplifier and a voltage-type doherty power amplifier;

7. The radio frequency amplification circuit of claim 6, wherein,

The combining circuit in the current type doherty power amplifier comprises a first phase shifting network;

8. The radio frequency amplification circuit of claim 7,

the doherty power amplifier comprises 1 carrier amplifier and N peak amplifiers;

9. The radio frequency amplification circuit of claim 6, wherein,

the combining circuit in the voltage type doherty power amplifier comprises a second phase shifting network and a second differential circuit;

10. The radio frequency amplification circuit of claim 6, wherein,

11. The radio frequency amplification circuit of claim 9 or 10, wherein the second differential circuit is a second balun.

12. A radio frequency front end module comprising the radio frequency amplifying circuit of claims 1-11.